The C6 is a great motor i would run a JP4 if u want good power and about 10min on a 7mm carb restictor. If u lookin for something more Smoother and not so mich bottom i would go with the RB 2045. Great all around pipe combos love it around 4 gallons i replaced the front and rear bearings for ceamics and the motor has more bottom now then before.